(19) |
 |
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(11) |
EP 0 926 172 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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14.03.2001 Bulletin 2001/11 |
(43) |
Date of publication A2: |
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30.06.1999 Bulletin 1999/26 |
(22) |
Date of filing: 11.12.1998 |
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(84) |
Designated Contracting States: |
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AT BE CH CY DE DK ES FI FR GB GR IE IT LI LU MC NL PT SE |
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Designated Extension States: |
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AL LT LV MK RO SI |
(30) |
Priority: |
24.12.1997 US 998303
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(71) |
Applicant: Bayer Corporation |
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Pittsburgh, PA 15205-9741 (US) |
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(72) |
Inventors: |
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- Shaffer, Myron W.
New Cumberland, WV 26047 (US)
- Martin, Kyli
Bridgeville, PA 15017 (US)
- Parkerson-Hoy, Shelley
Imperial, PA 15126 (US)
|
(74) |
Representative: Pettrich, Klaus-Günter, Dr. et al |
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c/o Bayer AG, Konzernbereich RP Patente und Lizenzen 51368 Leverkusen 51368 Leverkusen (DE) |
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(54) |
Coatings with improved resistance to suntan lotion |
(57) The present invention relates to an aqueous coating composition containing prior
to the reaction between components A) and B)
- A) 10 to 75 wt.%, based on the solids contents of components A) and C), of at least
one dispersion or solution of a polyester polyol containing carboxylate and/or sulphonate
groups, having a weight average molecular weight of 1,000 to 40,000, an OH number
of 15 to 100 and an acid number of 2 to 40 based on all of the carboxylate, carboxyl
and sulphonate groups,
- B) an ester-modified polyisocyanate having an average NCO functionality of 2 to 6
and containing 5 to 20 wt.% of ester groups (calculated as C3O2, MW 68), 5 to 18 wt.%
of isocyanate groups and 0 to 20 wt.% of chemically incorporated hydrophilic, nonionic
groups, wherein the preceding percentages are based on the solids content of the ester
modified polyisocyanate and
- C) 25 to 90 wt.%, based on the solids contents of components A) and C), of at least
one physically drying, aqueous polyurethane dispersion containing carboxylate and/or
sulphonate groups,
wherein components A) and B) are present at an NCO/OH equivalent ratio, based on
the isocyanate groups of component B) and the hydroxyl groups of component A), of
0.3:1 to 5:1.
The present invention also relates to the coatings prepared from these coating compositions,
which have improved resistance to suntan lotion.

